Category: FFA Design

Speaker: Dejan Trbojevic

Abstract: A proposal for accelerating electrons in the future Electron Ion Collider (EIC) using either Energy Recovery Linac ‘ERL’ or Recirculating Linac Accelerator (RLA) where a single Fixed Field Alternating Linear Gradient (FFA-LG) beam line is transports multiple energy electrons back to the linac. The designs are based on experience from the Cornell University and Brookhaven National Laboratory Energy Recovery Test Accelerator – ‘CBETA’. Examples of EIC at Relativistic Heavy Ion Collider (RHIC) and of the CERN Large Hadron Collider – LHeC are presented. Previous CBETA experience with the permanent magnets is used in the FFA-LG designs. The FFA-LG design is a racetrack shape, where, as in the CBETA, the arc is matched by adiabatic transition to the two (LHeC) or multiple straight sections (EIC in the RHIC tunnel). The combined function magnets are made of permanent Halbach type structures following success of the superb quality CBETA magnets but this time the horizontal aperture has to be open to allow radial dissipation of the synchrotron radiation. The straight sections are used to place the superconducting linacs.

Speaker: Elodie Higgins

Abstract: Future hadron therapy gantries will need to be smaller, lighter and cheaper. Depending on future clinical needs, they may also need to transport a large range of beam energies and to meet high rates of energy variation and dose delivery. One potential solution for this is beamlines or gantries based on fixed-field alternating gradient (FFA) optics. Here we outline plans and progress toward the design of a gantry incorporating FFA optics, and outline the concept of constructing a test-beamline for a scaled down gantry to suit a 1-4 MeV proton accelerator already in operation in Melbourne. This flexible test beamline could be used to test FFA concepts and research questions, as well as potentially providing a unique platform for radiobiology studies.

Speaker: Carol Johnstone

Abstract: The capability to produce high current, low loss, extracted external beams, either ion-specific or comprised of a cocktail of ion species, is an enabling technology for nuclear security, isotope production, and medical applications. A normal-conducting 0.5 to 15 MeV/u FFA with a strong-focusing field gradient has been designed for CW acceleration of light ions with a charge-to-mass ratio of 1/2 for up to a mA current in a separated-sector format. A technically-conservative baseline concept, which is optimal for radioisotope production such as alpha emitters and theranostic radiopharmaceuticals, has been designed to be scalable in gross physical parameters by a factor of 2 to 3 to realize a much smaller and lighter transportable system to advance new approaches in security applications, shown in Fig 1. The light ions species, including a mixed ion beam, can be dynamically chosen to provide a range of characteristic signals appropriate for specific material identification such as special nuclear materials. The central region of the machine has been replaced with an injection system consisting of an ECR source and an ion RFQ which accelerates ions to 0.5 MeV/u for horizontal injection into the ring through an electrostatic inflector. A conceptual design of the sector magnet and and 45 MHz 200 kV RF cavities will be presented in addition to overall engineering and design considerations.

Speaker: Shinji Machida

Abstract: vFFA concept can be used almost all the area of muon collider complex. I will give a design example of muon accelerator and arc optics of collider ring.

Speaker: Chris Rogers

Abstract: Injection into FFAs has been performed in the past by single turn kickers and charge exchange injection. In this paper injection into a vertical FFA is considered using a painting scheme using charge exchange and a system of pulsed magnets. Both horizontal and vertical magnets are required to manage coupled optics. Due to the short drift length, a multi-cell scheme is considered. The challenges inherent in such a scheme will be discussed.

Speaker: Yi-Nong Rao

Abstract: Utilizing dedicated cyclotrons to produce medical isotopes is an arising technology in hospitals across Canada. We’ve proposed to design an innovative H_2^+ superconducting cyclotron TR100+ for the production of commercially valuable radioisotopes. This
project will be aiming at proton energy of 70−150 MeV and proton current of ∼800 μA, since (i) cyclotron in this energy range is not developed world-wide; (ii) in this energy range numerous highly interested and increasingly demanded radio-nuclides can be produced, e.g. Sr-82 and Ac-225. Our machine will be designed to accelerate H_2^+, by injection from external ion source and extraction by stripping. This will allow to extract
proton beam of variable energies with very high extraction efficiency, thus allow to reduce activation caused by beam losses. The basic parameters and some simulation studies of our machine will be presented in this talk.

Speaker: Lige Zhang

Abstract: This is the study of a novel injection method based on an original proposal from W. Kleeven.

Speaker: Thomas Planche

Abstract: The transverse motion of particles in fixed field accelerators with mid-plane symmetry is entirely determined by the properties of the closed orbits. In this study I exploit this property to produce a variety of isochronous, and non-isochronous, magnetic field distributions. All the results presented in this paper are verified using CYCLOPS simulations.